The town of Ermina turns out to be a city for fish, where the whole town is submerged in water during high tide. The moment the party mentions Water God Dragon, the fish turn hostile.
Otherwise, they wouldn't have given us 
the potion that lets us breathe underwater.
Sonst hätten sie uns nichts gegeben,
womit wir unter Wasser atmen können.
O no nos darían medicina
para respirar bajo el agua.
Se não, eles não teriam nos dado uma
poção para respirar debaixo d'água.